You would need a sound card that supports optical digital input. Alternatively there are USB adapters that can do that.
Audacity is ridiculously good for freeware but has a bit of a learning curve.
If you are serious about digitising your collection, Tascam, Denon, a few others do proper analogue to digital recorders. I started with Audacity and some USB conversion, but my TEAC badged Tascam recorder does a far superior job without as much hassle. And such things aren’t that expensive.
Thanks … I thought it might have has a USB output. I don’t have a PC that can deal with an optical input.
On a different note …
A friend digitized a good number of his LP’s and then upgraded his cartridge and decided to do the whole process again. If he upgrades again he will probably redo everything.
Depends on why you digitise. If you digitise so that you can simply play your LPs on other systems in the house, then you probably won’t redo the whole process on every turntable upgrade.
If you are trying to make a pristine archive, then yes, you’re likely to chase your tail. Probably buying digital in the first place is simpler.
There are many ways to digitise LPs and others have mentioned, small digital recorders are affordable. However, something like a Focusrite Scarlett will give you an incredible audio interface to receive input from your turntable and will work with or without the Wiim. It is compatible with any computer / tablet, allowing the use of quality audio software incl Audacity. I would suggest there are far better options than the latter, if you are serious about your music.
As a side note, the Scarlett will also give you a very capable DAC / Headphone amp for circa £100 - not designed to compete with your NAIM gear, but as a quality pro audio component, it is not to be dismissed.
Warning: this can be a deep and absorbing rabbit hole…